A key witness against a former San Diego police officer accused of molesting women he pulled over in the Gaslamp District was recently arrested on suspicion of DUI, according to information obtained by 10News.The 31-year old woman, whose name 10News is withholding because she's the alleged victim of a sex crime, was stopped by police officers on suspicion of DUI on June 6. She was pulled over at 6:40 p.m., according to police. Police said the woman failed a field sobriety test and was taken to jail."She was the one who brought all those allegations to the surface," said attorney Jan Ronis, who is representing former SDPD officer Anthony Arevalos."Certainly, it is interesting," Ronis said of the woman's arrest. "It may be neutral, but it may also serve to undermine their case, and certainly her credibility," he added.The woman's arrest came three months after she told police investigators Arevalos pulled her over on March 8. She claimed Arevalos said he would not arrest her for DUI if she would give him her panties. According to court documents, Arevalos took the woman to a 7-Eleven store, where she removed her underwear in a private bathroom. According to those documents, Arevalos fondled the woman and eventually let her leave.After Arevalos was arrested, four more victims came forward, telling police similar stories.Arevalos now faces 18 felony counts involving 5 women he had contact with while he was on the job.Deputy District Attorney Sherry Thompson, who is handling Arevalos' case, said she will file more charges involving at least two more alleged victims next week.Thompson would not comment on how the arrest of the woman might impact her case against Arevalos.Arevalos, who was fired from the police department, pleaded not guilty.